| 摘要(英) |
In recent years, broadband wireless access (BWA) networks have been rapidly evolved to satisfy the increasing demands of users for ubiquitous and seamless access to various kinds of services. In order to achieve anytime, anywhere, and longer non-stop access to broadband networks through mobile devices with limited power, the power saving is a critical issue toward this objective.
Based on the basic sleeping mode concept, this thesis proposes a power saving centric scheduling scheme for uplink traffic while taking the quality of service (QoS) as a constraint requirements. The uplink resource allocation is quite different from that of the downlink resource allocation scheme, because the uplink traffic is queued at the mobile stations (MS) side and base station (BS) has no information about it and cannot allocate radio resource properly. MS will raise bandwidth request (BR) to BS, the BS according to radio resource to allocate bandwidth to each connection after receive BR, and bandwidth allocation in the UL-MAP to each MS.
In this thesis both of the rtPS and nrtPS service types are studies. These two service types have different QoS requirement and, therefore, have different design in their sleeping arrangement and scheduling policy. The simulation results are compared with the standard sleeping approach of the WiMax network. The simulation results show that the proposed scheme achieves better sleep efficiency than the standard scheme and can also satisfy the QoS requirements.
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| 參考文獻 |
[1] ”IEEE P802.16-2009” , IEEE Maintenance Task Group.
[2] “IEEE Std 802.16-2004” , IEEE Computer Society, IEEE Microwave Theory and Techniques Society, IEEE Standard, 1 October 2004.
[3] “Mobile WiMAX – Part 1: A Technical Overview and Performance Evaluation,” WiMAX Forum and WiMAX Forum CERTIFIED, August 2006.
[4] Shiao-Li Tsao , You-Lin Chen, “Energy-efficient packet scheduling algorithms for real-time communications in a mobile WiMAX system,” Computer Communications,Volume 31, Issue 10, pp. 2350-2359,25 June 2008.
[5] Shih-Chang Huang, Chien Chen, Rong-Hong Jan, and Cheng-Chung Hsieh, “An energy-efficient scheduling for multiple MSSs in IEEE 802.16e broadband wireless networks,” IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, pp.1-5,Sep. 2008
[6] Jing Wu, Jeonghoon Mo, Ting Wang ─”A Method for Non-Real-Time Polling Service in IEEE 802.16 Wireless Access Networks,”Vehicular Technology Conference, pp. 1518 – 1522,Oct. 2007.
[7] Y. Xiao, ”Energy saving mechanism in the IEEE 802.16e wireless MAN,” IEEE Communications Letters, vol 9, pp. 595-597, July 2005.
[8] Y. Zhang and M. Fujise, ”Energy management in the IEEE 802.16e MAC,” IEEE Communications Letters, vol 10, pp. 311-313, April 2006.
[9] Shih-Chang Huang, Chien Chen, Rong-Hong Jan, and Cheng-Chung Hsieh, “Energy efficient scheduling with QoS guarantee for IEEE 802.16e broadband wireless access networks,” In proceeding of International Wireless Communications and Mobile Computing Conference (IWCMC 2007), pp. 547-552, August 2007.
[10] Shih-Chang Huang, Chien Chen, Rong-Hong Jan, and Cheng-Chung Hsieh, “Energy efficient scheduling with QoS guarantee for IEEE 802.16e broadband wireless access networks,” In proceeding of International Wireless Communications and Mobile Computing Conference (IWCMC 2007), pp. 547-552, August 2007.
[11] WiMAX Forum Application AWGN Working Group. “WiMAX System Evaluation Methodology ,” September 2007.
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